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And top cosmetic, Doctor Nyla Raja, told Daily Star Online that she is confident the mum-of-one hasn't had her face completely reconstructed and instead opts for non-invasive treatments to get her "new look".

Looking at pictures of Kylie celebrating her birthday this week, Dr Raja noted how Kylie's trademark pout was "noticeably more defined around the cupids bow".

Last year the star revealed she had her lip filler dissolved and Dr Raja is positive she has kept to her word.

Kylie Jenner grew up in a famous family (Image: Getty Images)

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Dr Raja said: "Lip fillers can take six to 12 months to dissolve on their own, so Kylie may have skipped a few sessions after her first top-up this year so that her pout has gone down naturally as a result.

"Kylie still has a fuller pout, just a more natural enhancement than before. I think that natural beauty is becoming much more desirable, with the likes of Meghan Markle championing this look in the beauty headlines.

"I have definitely noticed an increase for more subtle non-invasive treatments, where people are questioning whether the look is down to a good diet, good genes, or a good doctor?”

Dr Raja believes Kylie has had treatments to make her jaw more defined (Image: Kylie Cosmetics)

Kylie Jenner says she has not gone under the knife (Image: Jason LaVeris/FilmMagic)

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Analysing her previous birthdays, Dr Raja believes Kylie had Ultherapy, which is a non-surgical treatment that works to tighten and define the jaw area for a more youthful appearance after her fans began pointing out her jawline was "more defined".

For her 21st fans speculated that her face had a "lifted complexion" and that her brows were more arched, which Dr Raya suggests is "most likely" the effects of Botox.

She said: "Anti-wrinkle injections work by blocking impulses to facial muscles causing the muscles to relax, thereby reducing the prominence of expression lines and achieving a more youthful radiant look, in which Kylie’s case left a more defined arch to her brow bone."